diff --git a/lua/mappings.lua b/lua/mappings.lua
index 9ee2aa2..b04d219 100644
--- a/lua/mappings.lua
+++ b/lua/mappings.lua
@@ -85,6 +85,7 @@ vim.api.nvim_create_autocmd('LspAttach', {
     s({ 'n', 'v' }, '<leader>ca', vim.lsp.buf.code_action, { buffer = ev.buf, desc = "Code action" })
     s('n', 'gr', telescope.lsp_references, { buffer = ev.buf, desc = "Goto references" })
     s({ 'n', 'v' }, '<leader>fm', ":Format<cr>", { buffer = ev.buf, desc = "Format" })
+    s({ 'v' }, '<leader>fl', ":!aligner.py<cr>", { buffer = ev.buf, desc = "Format signature" })
     s('n', '<MiddleMouse>', '<LeftMouse> :lua vim.lsp.buf.definition()<cr>',
       { buffer = ev.buf, desc = "Goto definition" })
   end,